Process for producing biomass fiber molding material

ABSTRACT

Disclosed is a process for producing biomass fiber molding material, and relates to the technical field of biological fibers. In the present disclosure, pretreated dried leaf fibers are softened by being subjected to a soaking process; the leaf fibers are grounded through a high-concentration grinder to obtain primary pulp of biomass fiber molding material; and then excess water is removed from the primary pulp of biomass fiber molding material through a pulp squeezing thickener to obtain the biomass fiber molding material. The primary pulp of biomass fiber molding material obtained by the production process of the present disclosure meets the specification for manufacturing safe paper, water is recycled in the production process to reduce water resource consumption; and the adding of auxiliary agents is reduced, which can reduce the cleaning of the product and improve the utilization rate of the leaf fibers.

TECHNICAL FIELD

The present disclosure relates to the technical field of biological fibers, and in particular to a process for producing a biomass fiber molding material.

BACKGROUND

Natural fibers come from organic raw materials. According to the original sources, the natural fibers can be divided into plant fibers (mainly composed of cellulose) and animal raw fibers (mainly composed of proteins). The natural fibers existing in the nature mainly include cotton, hemp, silk and animal wool. Among them, the molecular components of cotton and hemp are mainly cellulose, while the molecular components of silk and wool are mainly proteins (in the form of a polyamide polymer).

In the natural world, besides cotton and hemp, trees and grasses also have a large quantity of cellulose polymers. However, the cellulose in the trees and the grasses does not exist in the form of long fibers, and thus cannot be directly used as fibers. These natural cellulose polymers are chemically treated to change their physical structure without changing their chemical structure, so as to produce cellulose fibers that can be used as fibers and have a better performance. This technology is called an artificial fiber technology. Artificial fiber is one kind of chemical fiber, and synthetic fiber is another kind of chemical fiber. There is only one kind of artificial fiber, “viscose rayon” (also called artificial cotton), chemical component of which is cellulose polymer. Compared with the chemical fiber, the natural fiber has features such as inhomogeneous length and fineness; relatively good hygroscopicity and melting resistance; small strength and elongation ability; and good antistatic property, etc.

Veins, i.e., leaf fibers, are ribs protruding along the dorsal axis of a leaf that are formed by supporting tissues such as parenchymatous tissues and collenchymatous cells that do not contain chlorophyll surrounding the vascular bundles. According to arrangement thereof, it may be divided into venation, vein, etc. Larger veins are called major veins, and smaller veins are called minor veins. The end of a minor vein is extremely thin and is composed of 1-2 tracheids. The minor vein of any plant below a certain level does not form a vascular bundle sheath. The vascular bundle of the vein is branched from a stele of a stem, but its number and traveling manners vary from plant to plant.

In recent years, it has become more and more popular to use leaf fibers instead of other natural fibers for making safe paper products such as edible paper, and it is necessary to crush the leaf fibers. For general leaves of the broad leaf material, processing of mesophyll is complicated and the obtained leaf fibers are few. In the existing biomass fiber production technology, a large amount of auxiliary agents such as a softener are generally required to treat the leaf fibers, so that it is easier to macerate the leaf fibers. However, in order that the amount of the auxiliary agents contained in the biomass fiber formed later reaches a safety standard, a large amount of clear water are needed for washing, which cause a huge waste of water resources, and the clear water after washing needs to be purified to avoid the water containing a large amount of the auxiliary agents from polluting the environment.

SUMMARY

The technical problem to be solved by the present disclosure is to provide a production process capable of producing a biomass fiber molding material which is safe and can save water.

To solve the above-mentioned technical problem, the technical solution of the present disclosure is as follows.

A process for producing biomass fiber molding material is provided including the following steps:

S1. performing a soaking process by pouring dried leaf fibers into a soaking tank, and adding clear water into the soaking tank to soak the leaf fibers for 20-30 minutes;

S2 manually taking out the leaf fibers subjected to the soaking process, and putting the leaf fibers into a conveying mechanism to be conveyed into a grinding device for uniform grinding and kneading to form primary pulp of biomass fiber molding material;

S3. passing the primary pulp of biomass fiber molding material obtained by grinding in S2 through a screen to detect fineness of the primary pulp of biomass fiber molding material, wherein a proper amount of clear water is added during grinding;

S4. performing secondary grinding on coarse primary pulp of biomass fiber molding material screened out in S3 to form primary pulp that is in accord with the conditional quality, wherein a proper amount of clear water is added during grinding;

S5. conveying the primary pulp of biomass fiber molding material, which is detected as proper through a filter screen, to a compression device through the conveying mechanism for concentration process so as to obtain biomass fiber molding material; and

S6. sealing and packaging the biomass fiber molding material subjected to the concentration process in S5.

In some embodiments, the soaking tank is connected with a water reservoir through a pipeline.

In some embodiments, the conveying mechanism is a screw pipeline conveying mechanism with a tumbling gear.

In some embodiments, the grinding device is a high-concentration grinder.

In some embodiments, the compression device is a pulp squeezing thickener, and water content of the primary pulp of biomass fiber molding material after dehydration and concentration is 20-25%.

In some embodiments, the pulp press thickener is connected with the water reservoir through a pipeline.

In some embodiments, the leaf fibers are pretreated by removing mesophyll.

In some embodiments, raw materials for the leaf fibers adopts mature leaves of broad leaf materials, preferably one or more of poplar leaves, ginkgo leaves, yulan magnolia leaves, locust tree leaves and the like.

By adopting the aforementioned technical solution, the present disclosure obtains the following beneficial effects.

(1) Fresh mature leaves of broad-leaf materials, such as poplar leaves, ginkgo leaves, yulan magnolia leaves, locust tree leaves and the like, are selected for mesophyll removing process, and by natural soaking and microbial degradation, multiple leaf fibers can be easily obtained.

(2) After the leaf fibers are soaked and ground by the high-concentration grinder, the obtained primary pulp of biomass fiber molding material meets the specification for manufacturing safe paper.

(3) According to the process of the present disclosure, additional auxiliary agents for leaf fiber softening are not required, thereby avoiding the situation that the primary pulp of biomass fiber molding material needs to be washed at the later stage, which otherwise results in low yield of the biomass fiber molding material and environmental pollution.

(4) The soaking tank is connected with the water reservoir through a pipeline, and the pulp squeezing thickener is connected with the water reservoir through a pipeline. The excess water in the soaking tank and the water separated from the primary pulp of biomass fiber molding material when the primary pulp of biomass fiber molding material is concentrated by the pulp squeezing thickener, are led into the water reservoir through the pipeline for the next feeding and soaking process thereby recycling and saving the water resources.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

FIG. 1 is a flow chart of a process for producing a biomass fiber molding material of the present disclosure.

DETAILED DESCRIPTION

The specific embodiments of the present disclosure will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present disclosure, but is not construed as limiting the present disclosure. Furthermore, the technical features involved in various embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

As shown in FIG. 1, a process for producing a biomass fiber molding material includes the following steps.

S1. performing a soaking process by pouring dried leaf fibers into a soaking tank and adding clear water into the soaking tank to soak the leaf fibers for 20-30 minutes. The leaf fibers are dispersed and stirred by using a plowing tool during the soaking process, to ensure that the leaf fibers are completely soaked; and the soaking tank is connected with a water reservoir, and excess water in the soaking tank is discharged into the water reservoir for storage.

S2 manually taking out the leaf fibers subjected to the soaking process, and putting them into a screw pipeline conveying mechanism which conveys them into a grinding device for uniform grinding and kneading to form primary pulp of biomass fiber molding material. The conveying through the screw pipeline prevents the leaf fibers from sticking together and blocking the pipeline of the conveying mechanism in the conveying process due to the soaking process.

S3. passing the primary pulp of biomass fiber molding material obtained by grinding in S2 through a screen to detect the fineness of the primary pulp of biomass fiber molding material. A proper amount of clear water is during grinding, and a high-concentration grinder is selected for grinding. The high-concentration grinder has less fiber cutting, remarkable fibrillation effect and good fiber toughness, which can effectively ensure the lengths of short fibers such as broad-leaf wood pulp, grass pulp and the like, and clear water is added in the grinding process to prevent the primary pulp of biomass fiber molding material obtained by grinding from adhering to the high-concentration grinder.

S4. performing secondary grinding on coarse primary pulp of biomass fiber molding material screened out in S3 to form primary pulp that is in accord with the conditional quality. A proper amount of clear water is added during grinding. Similarly, pouring coarse leaf fibers into the high-concentration grinder for secondary grinding, so as to obtain proper primary pulp of biomass fiber molding material, thereby improving the utilization rate of the raw material.

S5. conveying the primary pulp of biomass fiber molding material, which is detected as proper through a filter screen, to a compression device through the conveying mechanism for concentration process so as to obtain biomass fiber molding material. During the process of soaking and grinding the leaf fibers, both the leaf fibers and the primary pulp of biomass fiber molding material carry a large amount of water, so a pulp squeezing thickener is adopted to remove the water from the primary pulp of biomass fiber molding material, and the primary pulp of biomass fiber molding material is concentrated until the water content thereof is 20-25% through a set dehydration effect; and

S6. sealing and packaging the biomass fiber molding material subjected to the concentration process in S5, so that preparation can be made for subsequent manufacture of the biomass fiber molding material.

In the process for producing a biomass fiber molding material of the present disclosure, fresh mature leaves of broad-leaf materials, such as poplar leaves, ginkgo leaves, yulan magnolia leaves, locust tree leaves and the like, are selected for mesophyll removing process, and by natural soaking and microbial degradation, multiple leaf fibers can be easily obtained. After the leaf fibers are soaked and ground by the high-concentration grinder, the obtained primary pulp of biomass fiber molding material meets the specification for manufacturing safe paper.

According to the process of the present disclosure, additional auxiliary agents for leaf fibers softening are not required, thereby avoiding the situation that the primary pulp of biomass fiber molding material needs to be washed at the later stage, which otherwise results in low yield of the biomass fiber molding material and environmental pollution. The soaking tank is connected with the water reservoir through a pipeline, and the pulp squeezing thickener is connected with the water reservoir through a pipeline. The excess water in the soaking tank and the water separated from the primary pulp of biomass fiber molding material when the primary pulp of biomass fiber molding material is concentrated by the pulp squeezing thickener, are led into the water reservoir through the pipeline to perform a soaking process for the next batch of feeding and soaking process thereby recycling water resources and saving water resources.

The embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and concept of the present disclosure, which still fall within the claimed scope of the present disclosure. 

1. A process for producing biomass fiber molding material, comprising the following steps: S1. performing a soaking process by pouring dried leaf fibers into a soaking tank, and adding clear water into the soaking tank to soak the leaf fibers for 20-30 minutes; S2 manually taking out the leaf fibers subjected to the soaking process, and putting the leaf fibers into a conveying mechanism to be conveyed into a grinding device for uniform grinding and kneading to form primary pulp of biomass fiber molding material; S3. passing the primary pulp of biomass fiber molding material obtained by grinding in S2 through a screen to detect fineness of the primary pulp of biomass fiber molding material, wherein a proper amount of clear water is added during grinding; S4. performing secondary grinding on coarse primary pulp of biomass fiber molding material screened out in S3 to form primary pulp that is in accord with the conditional quality, wherein a proper amount of clear water is added during grinding; S5. conveying the primary pulp of biomass fiber molding material, which is detected as proper through a filter screen, to a compression device through the conveying mechanism for concentration process so as to obtain biomass fiber molding material; and S6. sealing and packaging the biomass fiber molding material subjected to the concentration process in S5.
 2. The process for producing biomass fiber molding material of claim 1, wherein the soaking tank is connected with a water reservoir through a pipeline.
 3. The process for producing biomass fiber molding material of claim 1, wherein the conveying mechanism is a screw pipeline conveying mechanism with a tumbling gear.
 4. The process for producing biomass fiber molding material of claim 1, wherein the grinding device is a high-concentration grinder.
 5. The process for producing biomass fiber molding material of claim 1, wherein the compression device is a pulp squeezing thickener, and water content of the primary pulp of biomass fiber molding material after dehydration and concentration is 20-25%.
 6. The process for producing biomass fiber molding material of claim 5, wherein the pulp press thickener is connected with the water reservoir through a pipeline.
 7. The process for producing biomass fiber molding material of claim 1, wherein the leaf fibers are pretreated by removing mesophyll.
 8. The process for producing biomass fiber molding material of claim 1, wherein raw materials for the leaf fibers adopts mature leaves of broad leaf materials, preferably one or more of poplar leaves, ginkgo leaves, yulan magnolia leaves, locust tree leaves and the like. 